﻿(function ($) {
    jQuery.extend({


        createUploadIframe: function (id, uri) {
            //create frame
            var frameId = 'jUploadFrame' + id;
            var iframeHtml = '<iframe id="' + frameId + '" name="' + frameId + '" style="position:absolute; top:-9999px; left:-9999px"';
            if (window.ActiveXObject) {
                if (typeof uri == 'boolean') {
                    iframeHtml += ' src="' + 'javascript:false' + '"';

                }
                else if (typeof uri == 'string') {
                    iframeHtml += ' src="' + uri + '"';

                }
            }
            iframeHtml += ' />';
            jQuery(iframeHtml).appendTo(document.body);

            return jQuery('#' + frameId).get(0);
        },
        createUploadForm: function (id, fileElementId, data) {
            //create form	
            var formId = 'jUploadForm' + id;
            var fileId = 'jUploadFile' + id;
            var form = jQuery('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
            if (data) {
                for (var i in data) {
                    jQuery('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form);
                }
            }
            var oldElement = jQuery('#' + fileElementId);
            var newElement = jQuery(oldElement).clone();
            jQuery(oldElement).attr('id', fileId);
            jQuery(oldElement).before(newElement);
            jQuery(oldElement).appendTo(form);



            //set attributes
            jQuery(form).css('position', 'absolute');
            jQuery(form).css('top', '-1200px');
            jQuery(form).css('left', '-1200px');
            jQuery(form).appendTo('body');
            return form;
        },

        ajaxFileUpload: function (s) {
            // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout		
            s = jQuery.extend({}, jQuery.ajaxSettings, s);
            var id = new Date().getTime()
            var form = jQuery.createUploadForm(id, s.fileElementId, (typeof (s.data) == 'undefined' ? false : s.data));
            var io = jQuery.createUploadIframe(id, s.secureuri);
            var frameId = 'jUploadFrame' + id;
            var formId = 'jUploadForm' + id;
            // Watch for a new set of requests
            if (s.global && !jQuery.active++) {
                jQuery.event.trigger("ajaxStart");
            }
            var requestDone = false;
            // Create the request object
            var xml = {}
            if (s.global)
                jQuery.event.trigger("ajaxSend", [xml, s]);
            // Wait for a response to come back
            var uploadCallback = function (isTimeout) {
                var io = document.getElementById(frameId);
                try {
                    if (io.contentWindow) {
                        xml.responseText = io.contentWindow.document.body ? io.contentWindow.document.body.innerHTML : null;
                        xml.responseXML = io.contentWindow.document.XMLDocument ? io.contentWindow.document.XMLDocument : io.contentWindow.document;

                    } else if (io.contentDocument) {
                        xml.responseText = io.contentDocument.document.body ? io.contentDocument.document.body.innerHTML : null;
                        xml.responseXML = io.contentDocument.document.XMLDocument ? io.contentDocument.document.XMLDocument : io.contentDocument.document;
                    }
                } catch (e) {
                    jQuery.handleError(s, xml, null, e);
                }
                if (xml || isTimeout == "timeout") {
                    requestDone = true;
                    var status;
                    try {
                        status = isTimeout != "timeout" ? "success" : "error";
                        // Make sure that the request was successful or notmodified
                        if (status != "error") {
                            // process the data (runs the xml through httpData regardless of callback)
                            var data = jQuery.uploadHttpData(xml, s.dataType);
                            // If a local callback was specified, fire it and pass it the data
                            if (s.success)
                                s.success(data, status);

                            // Fire the global callback
                            if (s.global)
                                jQuery.event.trigger("ajaxSuccess", [xml, s]);
                        } else
                            jQuery.handleError(s, xml, status);
                    } catch (e) {
                        status = "error";
                        jQuery.handleError(s, xml, status, e);
                    }

                    // The request was completed
                    if (s.global)
                        jQuery.event.trigger("ajaxComplete", [xml, s]);

                    // Handle the global AJAX counter
                    if (s.global && ! --jQuery.active)
                        jQuery.event.trigger("ajaxStop");

                    // Process result
                    if (s.complete)
                        s.complete(xml, status);

                    jQuery(io).unbind()

                    setTimeout(function () {
                        try {
                            jQuery(io).remove();
                            jQuery(form).remove();

                        } catch (e) {
                            jQuery.handleError(s, xml, null, e);
                        }

                    }, 100)

                    xml = null

                }
            }
            // Timeout checker
            if (s.timeout > 0) {
                setTimeout(function () {
                    // Check to see if the request is still happening
                    if (!requestDone) uploadCallback("timeout");
                }, s.timeout);
            }
            try {

                var form = jQuery('#' + formId);
                jQuery(form).attr('action', s.url);
                jQuery(form).attr('method', 'POST');
                jQuery(form).attr('target', frameId);
                if (form.encoding) {
                    jQuery(form).attr('encoding', 'multipart/form-data');
                }
                else {
                    jQuery(form).attr('enctype', 'multipart/form-data');
                }
                jQuery(form).submit();

            } catch (e) {
                jQuery.handleError(s, xml, null, e);
            }

            jQuery('#' + frameId).load(uploadCallback);
            return { abort: function () { } };

        },

        uploadHttpData: function (r, type) {
            var data = !type;
            data = type == "xml" || data ? r.responseXML : r.responseText;
            // If the type is "script", eval it in global context
            if (type == "script")
                jQuery.globalEval(data);
            // Get the JavaScript object, if JSON is used.
            if (type == "json")
                eval("data = " + data);
            // evaluate scripts within html
            if (type == "html")
                jQuery("<div>").html(data).evalScripts();

            return data;
        }
    });
}(jQuery));
